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Design of the reactive dyes containing large planar multi-conjugated systems and their application in non-aqueous dyeing

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Chinese Journal of Chemical Engineering 2023年第2期54卷 264-271页

作者： Aiqin Gao Xiang Luo Huanghuang Chen Aiqin Hou Hongjuan Zhang Kongliang Xie College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China National Engineering Research Center for Dyeing and Finishing of Textiles Donghua UniversityShanghai 201620China

The development of pollution-free dyeing technology, including anhydrous dyeing and non-aqueous dyeing technologies, has always been an important way and research hot in energy conservation and emission reduction. Designing new structural dye molecules is the key to water-saving dyeing processes.Herein, three reactive dyes were designed and synthesized, which contained large planar multiconjugated systems and multi-reactive groups. The designed reactive dyes are expected to have high affinity and high fixations in non-aqueous or small bath dyeing processes. The reactive dyes were applied in the decamethylcyclopentasiloxane(DMCS) reverse micelle dyeing for cotton fabric. High exhaustion rate of 99.35%, 98.10% and 98.80%, and fixation rate of 95.15%, 96.34% and 94.40% for three dyes, R1,R2 and R3, could be respectively obtained. The dyes can be fully utilized and had excellent dyeing performance, fastness and levelling properties under the revere micelle dyeing. The cotton fabric is like an oil-water separator in the dyeing process, where the dye micelles rapidly absorb and permeate into the cotton fibers. DMCS circulates around the fabric to transfer mass and energy. After dyeing, the solvent can be separated quickly and reused. The new reactive dyes containing large planar and multi-conjugated systems have potential application in green and sustainable dyeing technology with less wastewater and higher utilization.

关键词： Reactive dyes Non-aqueous dyeing High fixation rate Waste water Synthesis Recovery

Superlubricitive engineering—Future industry nearly getting rid of wear and frictional energy consumption

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Friction 2020年第4期8卷 643-665页

作者： Jianbin luo xiang ZHOU State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Superlubricity has been developing very rapidly in recent years as a new and important area in tribology. Many new phenomena and materials, as well as some new mechanisms in both liquid and solid superlubricity have been obtained. In liquid superlubricity, tens of new kinds of liquids with superlubricity have been found (e.g., water-based liquids, oil-based lubricants, and liquids combined with additives of two-dimensional (2D) materials that exhibit very good superlubricity properties under high pressure). In the field of solid superlubricity, more materials with superlubricity have been observed, including graphene-to-graphene surfaces, highly oriented pyrolytic graphite to graphene surfaces, and heterostructure surfaces where a friction coefficient as low as 0.00004 has been obtained. However, superlubricity is still under laboratory research. What is the future of superlubricity? What is the barrier restricting superlubricity from industrial applications? How do we transfer superlubricity from scientific research to industrial application? These questions and application fields of superlubricity in near future have been analyzed, and the concept of"superlubricitive engineering"has been proposed in the present work.

关键词： superlubricitive engineering superlubricity liquid superlubricity solid superlubricity two-dimensional(2D)material lubrication

Planning and Control for Passive Dynamics Based Walking of 3D Biped Robots

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Journal of Bionic Engineering 2012年第2期9卷 143-155页

作者： Xiang Luo Wenlong Xu School of Mechanical Engineering Southeast UniversityNanjing 211189P.R.China

Efficient walking is one of the main goals of research on biped robots. Passive Dynamics Based Walking （PDBW） has been proven to be an efficient pattern in numerous previous approaches to 2D biped walking. The goal of this study is to develop feasible method for the application of PDBW to 3D robots. First a hybrid control method is presented, where a previously proposed two-point-foot walking pattern is employed to generate a PDBW gait in the sagittal plane and, in the frontal plane, a systematic balance control algorithm is applied including online planning of the landing point of the swing leg and feedback control of the stance foot. Then a multi-space planning structure is proposed to implement the proposed method on a 13-link 3D robot. Related kinematics and planning details of the robot are presented. Furthermore, a simulation of the 13-link biped robot verifies that stable and highly efficient walking can be achieved by the proposed control method. In addition, a number of features of the biped walking, including the transient powers and torques of the joints are explored.

关键词： 3D biped robot passive dynamics based walking balance control multi-space planning simulation

Sensors-integrated organ-on-a-chip for biomedical applications

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Nano Research 2023年第7期16卷 10072-10099页

作者： Hanxu Chen Zhiqiang luo xiang Lin Yujuan Zhu Yuanjin Zhao Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325001China

As a promising new micro-physiological system,organ-on-a-chip has been widely utilized for in vitro pharmaceutical study and tissues engineering based on the three-dimensional constructions of tissues/organs and delicate replication of in vivo-like microenvironment.To better observe the biological processes,a variety of sensors have been integrated to realize in-situ,realtime,and sensitive monitoring of critical signals for organs development and disease modeling.Herein,we discuss the recent research advances made with respect to sensors-integrated organ-on-a-chip in this overall review.Firstly,we briefly explore the underlying fabrication procedures of sensors within microfluidic platforms and several classifications of sensory principles.Then,emphasis is put on the highlighted applications of different types of organ-on-a-chip incorporated with various sensors.Last but not least,perspective on the remaining challenges and future development of sensors-integrated organ-on-a-chip are presented.

关键词： organ-on-a-chip(OOC) micro-physiological system tissue engineering sensors biomedical

A review of deep learning approach to predicting the state of health and state of charge of lithium-ion batteries

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Journal of Energy Chemistry 2022年第11期31卷 159-173,I0006页

作者： Kai luo xiang Chen Huiru Zheng Zhicong Shi School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Department of Chemical Engineering Tsinghua UniversityBeijing 100084China School of Computing Ulster UniversityBelfast BT151EDUnited Kingdom

In the field of energy storage,it is very important to predict the state of charge and the state of health of lithium-ion batteries.In this paper,we review the current widely used equivalent circuit and electrochemical models for battery state predictions.The review demonstrates that machine learning and deep learning approaches can be used to construct fast and accurate data-driven models for the prediction of battery performance.The details,advantages,and limitations of these approaches are presented,compared,and summarized.Finally,future key challenges and opportunities are discussed.

关键词： Lithium-ion battery State of health State of charge Remaining useful life Data-driven

Effect of the protrusion shape on gas ingestion of two sealing structures

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Chinese Journal of Aeronautics 2021年第4期34卷 320-331页

作者： Zeyu WU Xiang Luo Jianqin ZHU Hang CHEN Jiahua LIU School of Energy and Power Engineering Beihang UniversityBeijing 100083China National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 100083China

The windage loss caused by protrusion in a rotor–stator cavity has been studied in detail,and there are abundant fitting formulas that have been summarized to calculate the moment coefficients.Some other theorists have emphasized its effect on the sealing efficiency,proposing that installation of protrusion could alleviate gas ingestion.However,the protrusion shape which is an influential factor on the sealing efficiency has not been focused in previous research.Using the experimental method of measuring CO2 volume fraction,cavity pressure,and power consumption,we investigated the effects of several typical protrusion shapes on various parameters for two sealing structures,in order to obtain the optimal shape.Results showed that a variation of the protrusion shape had little impact on the static pressure,but the total pressure and the sealing efficiency increased in different degrees.Furthermore,even though the hexagon shape resulted in the highest sealing efficiency,we observed that the drop shape had the best overall performance in all of the eight models,which could result in higher efficiency of the turbine cavity.The combination of a radial seal structure and protrusion could improve sealing efficiency better.

关键词： Axial seal Cavity Gas ingestion Protrusion shape Radial seal Sealing efficiency Turbine

Intelligent Control Method of Power Supply for Tundish Electromagnetic Induction Heating System

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Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1188-1195页

作者： Xinxing xiang An luo Yan Li the Electrical and Information Engineering Department Hunan UniversityChangshaChina the School of Automation Central South UniversityChangshaChina

An intelligent control method is proposed to improve the performance of power supply for tundish electromagnetic induction heating,which can adequately regulate the tundish temperature.The topology structure of power supply for tundish electromagnetic induction heating is presented,and its working principle is analyzed.The power supply consists of six power units,and each of them consists of a fore-stage threephase rectifier and back-stage single-phase inverter.The feedforward control DC voltage is used by three-phase rectifier to obtain the stable DC voltage supplied to the inverter.The cloud controller based intelligent temperature control algorithm is combined with the power feed-forward algorithm to obtain accurate tracking of the output current and constant temperature control of the tundish steel in the back-stage inverter.The simulation and experiment are performed to verify the accuracy and effectiveness of the proposed method.

关键词： Cloud control electromagnetic induction heating rectifier-inverter tundish

An Easy‑to‑Prepare Flexible Dual‑Mode Fiber Membrane for Daytime Outdoor Thermal Management

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Advanced Fiber Materials 2022年第5期4卷 1058-1068页

作者： Bo xiang Rong Zhang Xujia Zeng Yanlong luo Zhenyang luo College of Science Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Materials Science and Engineering Collaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093People’s Republic of China

Excellent outdoor thermal management is vital for public health and safety.However,the ever-changing and uncontrol-lable outdoor environmental conditions,such as irrepressible sunlight and drastic temperature fluctuations,bring majestic challenges to outdoor thermal management.Here,we report a significant advancement toward designing and fabricating a novel fiber membrane with a dual-function of radiative cooling and solar heating for an efficient daytime outdoor thermal management.Unlike the reported dual-mode thermal management materials,which are usually fabricated by compounding organic polymers and metal/inorganic non-metal materials,our fiber-based membrane is composed of only two polymers,i.e.,poly(vinylidene fluoride-co-hexafluoropropene)(PVDF-HFP)and polypyrrole(PPy).The resulting membrane presents outstanding outdoor thermoregulation capacity,with a practically attainable sun-ambient cooling temperature of~4.5℃,super-ambient heating temperature of~35.8℃,in an outdoor environment,under solar intensity(Isolar)of~850 W m^(-2).Fabrication process is simple and cost-effective,which offers the possibility of preparing large-scale products.Owing to the scalable and simple fabrication process,and the exceptional outdoor thermoregulation ability,this dual-mode fiber membrane has great potential to maintain a comfortable outdoor environment for human activities and industrial operations.

关键词： Radiative cooling Solar heating Solar reflectance Infrared emittance Daytime outdoor thermal management

Effect of rotor-mounted protrusion on sealing performance and flow structure in rotor-stator cavity

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Chinese Journal of Aeronautics 2018年第11期31卷 2057-2072页

作者： Nan CAO Xiang Luo Zeyu WU Jie WEN National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

This paper presents an experimental investigation on the effect of protrusion radial position and height on the sealing performance and flow structure in the rotor-stator cavity. The rotormounted protrusions are assembled at three radial positions and are set to three heights. The cavity is equipped with three rim seals: a radial seal, an axial seal and a seal with double fins on the stator.The annulus Reynolds number is set at 4:39 ×10;and the rotational Reynolds number ranges from 7:51×10;to 1:20×10;. Heat and mass transfer analogy is applied. Pressure and CO;concentration are measured. The experimental results show that in cavities with different rim seals, radial distributions of the sealing efficiency, pressure and swirl ratio are basically the same. The sealing performance is improved by protrusions compared with the cavity without protrusion and improves with the increase of protrusion radial position and height. The effect of protrusion increases with the increase of the rotational Reynolds number. The windage loss and the flow resistance introduced by protrusions are investigated. It is found that induced windage loss and flow resistance decrease with the increase of protrusion radial position but increase with the protrusion height.

关键词： Height Protrusion Radial position Rim seal Sealing performance